For decades, air defence followed a familiar trajectory: more sensors, smarter missiles, higher costs. The war in Ukraine has attacked that logic head‑on.

BAE Systems’ Tridon Mk2—now ordered by Sweden in a €153 million ($180 million) deal with the Swedish Defence Materiel Administration—represents a deliberate pivot away from interceptor‑only thinking and back to something older, cheaper, and brutally effective: naval‑grade artillery repurposed for land warfare.

Tridon Mk2 is a truck‑mounted 40 mm air‑defence gun system designed to counter drones, cruise missiles, aircraft, and even armoured ground targets. According to BAE Systems, it was developed specifically to address a gap in modern air defence—what happens when your enemy can throw low‑cost threats at you in volume.

Missiles can kill those threats. But at a price—and at a pace—that increasingly makes no economic sense.

The Swedish order did not come out of nowhere. In February 2026, Sweden and Denmark jointly procured Tridon Mk2 systems and donated them to Ukraine, integrating them with command‑and‑control systems and radar to reinforce Ukrainian air defences during persistent missile and drone attacks. That move effectively turned Ukraine into a proving ground, validating the relevance of gun‑based air defence under real combat pressure.

What Tridon Mk2 offers is not novelty, but magazine depth. Guns don’t run out of interceptors after a dozen shots. Ammunition is cheaper, easier to replenish, and tactically flexible. The system can rapidly engage multiple targets, making it particularly suited for defending military units, cities, and critical infrastructure against swarms of drones or low‑flying cruise missiles.

BAE Systems emphasizes that Tridon Mk2 is high‑precision, cost‑effective, and simple to maintain, with a modular design that allows integration of new technologies over time. Mounted on a truck, it can relocate quickly—an essential feature in environments where static air‑defence positions are priority targets.

There is also a strategic message embedded in Sweden’s choice. Tridon Mk2 does not replace missile defence; it complements it. It sits behind high‑end interceptors, preserving those assets for truly critical threats while handling the daily attrition war of drones and low‑cost missiles. This layered approach reflects lessons learned not in theory, but through active conflict.

Lena Gillström, president of BAE Systems Bofors, framed the system as a response to “ever‑evolving aerial threats,” underscoring that the challenge is not just technological sophistication, but adaptability and sustainability in long‑term conflict.

In many ways, Tridon Mk2 is a rejection of technological maximalism. It acknowledges that future wars will not be won by exquisite systems alone, but by those that combine precision, volume, and endurance.

Air defence, it turns out, doesn’t always need a bigger brain.
Sometimes, it just needs a bigger magazine.

‍